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[aprssig] Building a new digi (RX performance?)

Bill Vodall WA7NWP wa7nwp at gmail.com
Thu Apr 2 16:47:31 UTC 2009


>> I use the TH-D7 as a bench mark, since so many of them are out
>> there, and they are an all-in one factory integrated receiver
>> and decoding system.  I have found that they can decode signals
>> down to one bar on the LCD display.  We measured that minimum
>> signal as -117 dBm
>>
>> I wonder if you have done any testing of your combination as to
>> on-air receive and packet decode performance?
>
> I just checked on the bench again, and it's decoding at -116 dBm, minus
> 1 N connector and 2 BNCs worth of insertion loss.

With or without pre-emphasis?   That can make a major difference in
packet decoding depending on the sending stations setup.

Bill - WA7NWP



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